• Injuries to the spinal chord and brain may cause severe damage to the vampire, as it does with humans.
  
• Levels of seratonin in the brain drop drastically, causing violence and aggression.
  
• Dopamine is released into the brain during feeding, causing a sort of narcotic affect on the vampire. This can cause the vampire to feed just to feel this "high"
  
• circadian rhythms chemical changes in the brain that help us "rise and shine" with the morning light are reversed in vampires
  

Sense Organs

• Vampires senses are highly acute. These aid the vampire in hunting, allowing them to be alert while feeding.
  
• The iris in each eye of the vampire will become hyperdialated, giving the illusion of a fully black pupil. This allows the vampire to be able to move around and see better at night, the best time for feeding. This also means that any contact with bright lights, i.e. the sun, the vampire is rendered blind.
  
• Both hearing and smelling become very acute. Vampires contain double the receptacles in their noses and ears than humans do.
  

Circulatory System

• The most differences between humans and vampires reside in the circulatory system.
  
• vampire blood becomes ichor. Adaptions to hemoglobin in the blood cells makes vampire blood appear black and is low in iron, contrary to human blood
  
• The vampire's blood is pumped via the contraction of skeletal muscle instead of the heart, which eventually decays from disuse.
  
• Extremely large amounts of addrenaline can be found in the vampires blood, giving the vampire incredable speed and strength.
  

Physical Aspects 

• Hair is lost within ten years of transformation because use of body heat is no longer needed, due to the lack of warmth in blood
  
• During the comatose state, the "eyeteeth" of the upper and lower jaw begin to grow and sharpen, allowing easier feeding 
  
• Skin of the vampire becomes pale and thin, allowing veins to be easily shown through it. This is due to the lack of mellatonine that the skin gets to produce because of remaining in constant darkness. All fats are eventually drained away and the vampire will become very skinny and appear corpse-like. However do not underestimate these lanky creatures for they are still quite powerful
  
• Fingernails, beginning during the coma, grow thickly and rapidly. To make prey easier to catch, some vampires file their nails to a point
  

Inner Tissue

• Connective and muscular tissue developes a fast twitch, which gives the user an ability for quick bursts of speed and strength (ideal for hunting)
  
• Skeletal tissue strengthens to support the newly formed muscles
  

Aging and Life Expectancy

• Due to unkept records and undocumenting of "living" vampires, there really isn't any way to determine how long a vampire can live. The current record for life expectancy is around 200 years. This longevity is due to the DNA. In normal humans, the protective caps on the end of chromosomes eventually disslove over time. This is non-existent in vampires.